Typewriting-machine



B. C. STICKNEY. TYFEWRITING MACHINE. APPLICATION FILED NOV,l3,19I7.

1,386,379. Paented Aug. 2, 1921.

lllilill iff;

UNITED STATES PATENT OFFICE.

BURNHAM C. STIGKNEY, OF ELIZABETH, NEW JERSEY, ASSIGNOR TO UNDERWOOD TYPEWRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPEWRITING-MACHINE.

Application led November 13, 1917.

To @ZZ whom it 'm (1y Concern Be it known that I, BURNHAM C. STICK- isEY, a citizen of the United States, residing in Elizabeth, in the county of lfnion and State of New Jersey, have invented certain new and useful Improvements in Typewriting-Machines, of which the following is a specification.

This invention relates to cylindrical platens of typewriting machines, and its object is to )roduce an improved platen ot' the kind in w ich a resilient surface gives elearcut type impressions, and in which the iinpact is deadened so as to lessen the noise incident to the types striking the platen.

The platen is formed of a series of annular disks placed side by side and bound together by tie-rods extending through the seiies. The disks may be assembled and secured together to foi'iii a cylindrical tube with a somewhat rough surface and then turned down to form a smooth platen surface.

The disksmay be formed of eolin, which is universally used for slioe-soles, being manufactured by the Goodyear Tire and Rubber Company of Akron, Ohio. This is a tough, light, silent, wear-resisting, and flexible synthetic product.

To assist in deadening the noise of the impact, the disks may be provided with internal openings, which are preferably grouped together to forni long cells. rFliese cells are filled with some granular material, suclias sand, to absorb the vibiation at the type-stroke, and reduce the noise. The cells or openings may be arranged in groups of three or any other suitable number, and the groups ai'e staggered relatively to one another around the platen as a unit.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure l is a longitudinal section through the center of the platen on the lines l-l of Fig. 2.

Fig. 2 is a sectional elevation of the platen, on the line 2 2 of Fig. l, looking in the direction of its axis.

Fig. 3 is a detail` perspective view of a portion of the platen, with portions broken away to show the internal cells.

Aniiular disks l aie arranged side by side to formv in the aggregate a cylinder. The

Specification of Letters Patent.

Patented Auo. 2, i921.

serial No. 201,742.

disks may be made of Neolin or any niaterial 1n imitation thereof, such that a iirm even surface may be produced, whichv will have the necessary resilience to give smooth even characters when the work-sheet thereon is struck by the type-bars, Each disk l may be perforated at preferably three equidistant points, the perforations or openings being placed in alinement'with one another when the disks are assembled. rFie-rods 3 extend through the openings 2, so as to jam the disks 1 together in a tight pack.

.The series of disks l is provided at its ends with metallic circular plates 4, to form firm abutments against which nuts threaded onto `the screw-threaded ends of the tie-rods 3, can exert the force necessary to squeeze the disks l together, The plates 4 are provided with hubs G, each of which may be provided with a central opening through which a platen axle 7 may extend. rFhe shaft may be secured to the hubsl in any suit- .able manner, as by means of set-screws 8 extending through threaded openings provided in the-hubs G. A

The disks l may also be provided individually with one or more openings Si which form cells. These cells 9 may be staggered on the different disks, and may be arranged in groups of three, as shown in Figs. l and 3, or any other number. The cells 9 are preferably half filled with tine shot or sonie other granular material, such as sand. so that the vibrations caused by the impact of thetypes will be largely absorbed, to reduce or inutile the noise.

`The disks may be assembled and then jammed together to form a close-set mass by screwing up the nuts 5. The platen as a whole may be then turned down on a lathe, to the desired diameter with an even smooth surface, without any appreciable crevices between the circular disks. The platen may then he ground to give it the exact size and surface finish and may then be rotatably mounted in a platen frame 10 of a typewriting machine. The platen thus formed will give suiiicient resilience to give clear typewriting. Some of the features of improvement are also of value in case disks of leather are use, as in Patent 635,609.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

granular material.

Having thus described my invention, I claim:

l. A platen ycomprising a series 0f disks placed side by side to form a cylinder, said disks having cellulary openings therein, the cellular openings in a group of juxtaposed disks being arranged `in register with each other, and groups of cellular openings for adjacent groups of disks being arranged in staggered relation with respect to one another, and a granular material in said cellular openings to deaden the sound vibrations.

2..A platen having a series of sub-surface cells therein staggered relatively to one another for adjacent regions of the platen, so as to break up the solid sound-conducting continuity of the platen, and loose granularv fillings for the cells ofsaid platen.

3. A typewriter platen comprising disks of Neolin packed side to side and under compression, and having cells partly filled with sand, shot or other noise-mufiling 4. A cylindrical platen body throughout with cells incomplete y filled with loose sand or granular material for the purpose specified.

5. A cylindrical platen body of built-up sections, said sections provided with cells incompletely filled with loose sand or granular material, for the purpose specified.

6. A typewriter platen 4comprising annular disks of a material suitable for the platen .surface and having openings,-e'nds for, the

platen, an axle passing through said ends', and granular material adapted t0 deaden sound within the openings in said disks.

7. A typewriter platen comprising annular disks of a material suitable for the platen surface, andv having openings con:

tained between the inner and outer surface of the disks, each opening adapted to have its lend closed by la similar adjacent disk, and means for holding the disks" under compresslon.

8. A typewriter platen comprising a series of disks of suitable material packed side by side and having cells partly filled with noisemufiiin granular material, end plates having hugs and positioned one at each end of said series of disks, and tie-rods passing through said disks and end plates tohold the disks under compression.

9. A laten comprisinga series of disks placed side by side to form a cylinder, said disks having openings contained between the inner and outer surface of the disks, each opening adapted to have its end closed by a similaradj acent disk, end plates having hubs and positioned one at each end vof said series of disks, and tie-rods passing through said disks and end plates t0 hold the disks under compression.

l0. A platen comprising a series of disks placed side, by side to; form a cylinder, said disks having cellularfopenings therein, the cellular openings in a group of juxtaposed disks being arranged in register with each other, groups ofv cellular openings for adjacent groups of disks being arranged in staggered relation with respect 'to one another, a granular material in said cellular openings to deaden the sound vibrations, end plates having hubs and positioned one at each end of said series of disks, and tie-rods passing through said disks and end plates to clamp the disks together..-

BURNHAM c. STICKNEY. Witnesses i M. E. \MEEK. ARTHUR A. oHNsoN. 

